Abstract
The occurrence of Rb and Cs in coal samples from Iqe coalfield was analyzed by a sequential chemical extraction experiment. Five types of Rb and Cs were determined in the coal: water soluble, ion exchangeable, organic bonded, carbonate, and silicate. The results indicated that the occurrence of Cs is similar with Rb in coal, and nearly all Rb and Cs are distributed in silicate. The occurrence of Rb and Cs is most likely associated with silicate minerals in coal. With the high correlation between Rb, Cs, and K, and the high content of kaolinite and illite in these coal samples, it can be inferred that illite probably is the main carrier of Rb and Cs. Minor amounts of Rb and Cs may also be adsorbed by kaolinite in Iqe coal, and Cs may exist in other states, such as an exchangeable ion.
Highlights
More and more valuable trace elements, such as Li, Ga, rare earth elements, Ge, Nb, Ta, Sc and so on, have been found in coal (Qin et al, 2015; Qin and Li, 2015; Sun 2015; Sun et al, 2010, 2012a, 2012b, 2013a, 2013b, 2015, 2016; Xiao et al, 2016; Xu et al, 2011; Yi et al, 2015; Zhao et al, 2009, 2014)
Seredin (2003) pointed out that Rb was mainly absorbed by clay material rather than organic matter, whereas Cs was presumably absorbed by both components in the Spetzugli brown coal, and Yossifova et al (2011) reported that Rb in the Pernik coal has a distinctly inorganic mode of occurrence
The purpose of this paper is to study the mode of occurrence of Rb and Cs in Iqe coal
Summary
More and more valuable trace elements, such as Li, Ga, rare earth elements, Ge, Nb, Ta, Sc and so on, have been found in coal (Qin et al, 2015; Qin and Li, 2015; Sun 2015; Sun et al, 2010, 2012a, 2012b, 2013a, 2013b, 2015, 2016; Xiao et al, 2016; Xu et al, 2011; Yi et al, 2015; Zhao et al, 2009, 2014). The random vitrinite reflectance, ash yields, volatile matter (daf: dry and with ash basis), and moisture (ad: air-dry basis) are 0.659%, 40.5%, 23.05%, and 3.2% of the coal samples, respectively. It belongs to higher ash (40.5%) and lower moisture (3.2%) coals. The element content was determined by inductively coupled plasma mass spectrometry (ICP-MS) in the Key Laboratory of Resource Exploration Research of Hebei Province. XRD analysis of the low-temperature ashes and the parting samples was performed on a D/max-2500/PC powder diffractometer with Ni-filtered Cu-K radiation and a scintillation detector. The XRD pattern was recorded over a 2y interval of 2.6–70, with a step size of 0.01
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